#!/usr/bin/env python
"""Test the running system for features availability. Exit with zero
if all features are there, non-zero otherwise. If a feature name is
prefixed with "no-", the absence of feature is tested.
"""
import optparse
import os, sys
import hghave
 
checks = hghave.checks
 
def list_features():
    for name, feature in sorted(checks.iteritems()):
        desc = feature[1]
        print name + ':', desc
 
def test_features():
    failed = 0
    for name, feature in checks.iteritems():
        check, _ = feature
        try:
            check()
        except Exception, e:
            print "feature %s failed:  %s" % (name, e)
            failed += 1
    return failed
 
parser = optparse.OptionParser("%prog [options] [features]")
parser.add_option("--test-features", action="store_true",
                  help="test available features")
parser.add_option("--list-features", action="store_true",
                  help="list available features")
parser.add_option("-q", "--quiet", action="store_true",
                  help="check features silently")
 
def _loadaddon(quiet):
    if 'TESTDIR' in os.environ:
        # loading from '.' isn't needed, because `hghave` should be
        # running at TESTTMP in this case
        path = os.environ['TESTDIR']
    else:
        path = '.'
 
    if not os.path.exists(os.path.join(path, 'hghaveaddon.py')):
        return
 
    sys.path.insert(0, path)
    try:
        import hghaveaddon
    except BaseException, inst:
        if not quiet:
            sys.stderr.write('failed to import hghaveaddon.py from %r: %s\n'
                             % (path, inst))
        sys.exit(2)
    sys.path.pop(0)
 
if __name__ == '__main__':
    options, args = parser.parse_args()
    _loadaddon(options.quiet)
    if options.list_features:
        list_features()
        sys.exit(0)
 
    if options.test_features:
        sys.exit(test_features())
 
    quiet = options.quiet
 
    failures = 0
 
    def error(msg):
        global failures
        if not quiet:
            sys.stderr.write(msg + '\n')
        failures += 1
 
    for feature in args:
        negate = feature.startswith('no-')
        if negate:
            feature = feature[3:]
 
        if feature not in checks:
            error('skipped: unknown feature: ' + feature)
            sys.exit(2)
 
        check, desc = checks[feature]
        try:
            available = check()
        except Exception, e:
            error('hghave check failed: ' + feature)
            continue
 
        if not negate and not available:
            error('skipped: missing feature: ' + desc)
        elif negate and available:
            error('skipped: system supports %s' % desc)
 
    if failures != 0:
        sys.exit(1)